It is a buggy mouse, the sensor is very problematic, the version with the philips twin eye sensor. Ill tell you my experience with this mouse, the mouse is comfortable, it has an ergonomic form factor, the swithces and wheel are nice, and it has nice features, BUT it has a problem, the sensor, that philips twien eye 4000dpi sensor, it goes crazy everytime I lift it up and reposition it, it happens a lot with mice with this type of sensor, thats why razer atatched a lift off sensor to the imperator and the mamba. This happens with a friends black too.
I tried updating the firmware, but the download section is a total MESS, I downloaded everything on the download section and nothing worked except for the old and clunky software aplication, and one of the downloads gave me a blue screen, seriously update that download section.
If the sensor worked as well as the rest of the mouse this would be a perfect mouse, and the software really needs a rework, i dont get why thermaltake makes a different software for each mouse, why just dont make a standar software for all your peripherals like the razer synapse or the logitech gaming software, I have used this black mouse and the saphira and the software is very clunky, misleading, buggy, not intuitive, poorly designed.
I like the hardware design of your products a lot, good sensor and component choises, but the firmware and software just kills this products.